CN106370915B - Three-wire system and four-wire system universal transmitter - Google Patents
Three-wire system and four-wire system universal transmitter Download PDFInfo
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- CN106370915B CN106370915B CN201610872388.3A CN201610872388A CN106370915B CN 106370915 B CN106370915 B CN 106370915B CN 201610872388 A CN201610872388 A CN 201610872388A CN 106370915 B CN106370915 B CN 106370915B
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Abstract
The invention discloses a novel three-wire system and four-wire system universal transmitter, which is characterized in that: the power supply comprises a power supply input adjusting and stabilizing unit, a power supply polarity reversing output unit and a signal filtering unit which are respectively connected with the power supply input adjusting and stabilizing unit, a signal amplifying and outputting form switching unit connected with the signal filtering unit, and a zero point adjusting unit connected with the signal amplifying and outputting form switching unit. In principle, the whole circuit is modularly designed, so that the circuit is simple and reliable; in the range of 15-36V wide voltage power supply, the mutual switching between the three-wire system transmitter and the four-wire system transmitter is realized by adjusting the switch, so that different using effects are achieved.
Description
Technical Field
The invention relates to the field of transmitters, in particular to a three-wire system and four-wire system universal transmitter.
Background
The voltage type transmitters are classified into three-wire type transmitters and four-wire type transmitters. Conventional transmitters can only be single, fixed to form an output mode under defined conditions. When a three-wire transmitter is used in a four-wire environment, or when a four-wire transmitter is placed in a three-wire environment, the correct signal is often not acquired. Existing transmitters in the market cannot meet the variable requirements of three wires and four wires.
Disclosure of Invention
The invention aims to solve the technical problem of providing a three-wire system and four-wire system universal transmitter, which realizes the mutual switching between the three-wire system transmitter and the four-wire system transmitter through an adjusting switch in the range of 15-36V wide voltage power supply, thereby achieving different using effects.
The technical scheme of the invention is as follows:
the three-wire system and four-wire system universal transmitter comprises a power input adjusting and stabilizing unit, a power polarity reversing output unit and a signal filtering unit which are respectively connected with the power input adjusting and stabilizing unit, a signal amplifying and outputting form switching unit connected with the signal filtering unit, and a zero adjusting unit connected with the signal amplifying and outputting form switching unit;
the POWER input adjusting and stabilizing unit comprises a POWER chip U6, a stabilizing chip U2, a resistor R1, a resistor R2, a diode D1, a diode D2, an inductor L1 and a plurality of capacitors, wherein the POWER input end POWER is respectively connected with one end of the capacitor E1, one end of the capacitor C1 and pins 7 and 8 of the POWER chip U6 through the diode D1, the pins 1 and 2 of the POWER chip U6 and the cathode of the diode D2 are respectively connected with one end of the inductor L1, one end of the resistor R1, one end of the capacitor C2, one end of the capacitor E2, one end of the capacitor C3, one end of the capacitor C5, one end of the capacitor C4, one end of the capacitor E3 and pin 1 of the stabilizing chip U2 are respectively connected with the other end of the inductor L1, the other end of the resistor R1, the other end of the capacitor C2 and the pin 4 of the POWER chip U6 are all connected with one end of the resistor R2, one end of the capacitor E4 and one end of the capacitor C6 are all connected with the pin 3 of the voltage stabilizing chip U2, and the other end of the capacitor E1, the other end of the capacitor C1, the pins 3,5,6 and 9 of the POWER chip U6, the positive electrode of the diode D2, the other end of the resistor R2, the other end of the capacitor E2, the other end of the capacitor C3, the other end of the capacitor C5, the other end of the capacitor C4, the other end of the capacitor E3, the pins 2,4 and 5 of the voltage stabilizing chip U2, the other end of the capacitor E4, the other end of the capacitor C6 and the sensor terminal BLACK are all grounded;
the power polarity reversing output unit comprises a polarity reversing chip U1, a capacitor E5, a capacitor E6, a capacitor C7 and a capacitor C8, wherein two ends of the capacitor E5 are respectively connected with pins 2 and 4 of the polarity reversing chip U1, one end of the capacitor E6, one end of the capacitor C7 and one end of the capacitor C8 are respectively connected with a pin 5 of the polarity reversing chip U1, and the other end of the capacitor E6, the other end of the capacitor C7 and the other end of the capacitor C8 are respectively connected with a pin 3 of the polarity reversing chip U1;
the signal filtering unit comprises a capacitor C11, a capacitor C12, a capacitor C13, a resistor R3 and a resistor R4, wherein one end of the capacitor C11, one end of the capacitor C13 and one end of the resistor R3 are all connected with a sensor terminal GREEN, the other end of the capacitor C13, one end of the resistor R4 and one end of the capacitor C12 are all connected with a sensor terminal WHITE, and the other end of the capacitor C11 and the other end of the capacitor C12 are grounded;
the zero point adjusting unit comprises a resistor R13, a resistor R11, a resistor R14, a resistor R12 and an adjustable resistor RP2, wherein one end of the resistor R13, one end of the resistor R11, a pin 8 of the polarity reversing chip U1, one end of the capacitor C6 and a pin 3 of the voltage stabilizing chip U2 are all connected with a sensor terminal RED, one end of the resistor R14 and one end of the resistor R12 are all grounded, the other end of the resistor R13 and the other end of the resistor R11 are all connected with a fixed joint of the adjustable resistor RP2, and the other end of the resistor R14 and the other end of the resistor R12 are all connected with the other fixed joint of the adjustable resistor RP 2;
the signal amplifying and outputting type switching unit comprises an operational amplifier U3, an operational amplifier U4, a plurality of resistors and an adjusting switch K1, wherein a pin 3 of the operational amplifier U3 is connected with the other end of the resistor R3, an adjustable connector of the adjustable resistor RP2 is connected with the other end of the resistor R4, one end of the resistor R1A and one end of the resistor RA after being connected in parallel are connected with one end of the resistor R5, one end of the resistor R6 is connected with a pin 2 of the operational amplifier U3, the other end of the resistor R1A and one end of the resistor RA after being connected in parallel are connected with a fixed connector of the adjustable resistor RP1, the other end of the resistor R6, one end of the resistor R8 is connected with a pin 6 of the operational amplifier U3, the other end of the resistor R8 is connected with an output end VOUT1, a pin 7 of the operational amplifier U3, a pin 7 of the operational amplifier U4 is connected with one end of the capacitor C4, one end of the capacitor C8, a pin 5 of the capacitor C4 is connected with the other end of the resistor R4, a pin 10 of the common resistor R1 is connected with the other end of the resistor R4, and the common resistor R1 is connected with the other end of the common resistor R1, and the common resistor R2 is connected with the common resistor R1.
The novel three-wire system and four-wire system universal transmitter comprises a sensor wiring terminal and a POWER supply output end, wherein the sensor wiring terminal comprises a sensor wiring terminal RED, a sensor wiring terminal BLACK, a sensor wiring terminal GREEN, a sensor wiring terminal WHITE and a frequency shielding interface PB1, the POWER supply output end comprises an output end VOUT1, an output end VOUT2, a POWER supply positive input end POWER, a ground end GND and a frequency shielding interface PB2, and the frequency shielding interface PB1 and the frequency shielding interface PB2 are connected into a transmitter shell to shield external signals in a frequency mode.
Compared with the prior art, the invention has the advantages and effects that:
(1) The whole transmitter adopts a high-performance wide-voltage power supply chip, and the normal operation of the transmitter which can output in a lossless manner in a 15-36V power supply range is realized.
(2) In principle, the whole circuit is modularly designed, so that the circuit is simple and reliable.
(3) The power supply part of the transmitter is subjected to two-stage voltage stabilization, so that the output is more stable, and a later-stage circuit can be effectively protected.
(4) The whole circuit adopts an accurate design, and an anti-interference device is mostly adopted, so that the anti-interference capability is strong.
(5) The whole transmitter utilizes an adjusting switch, so that the switching between three-wire and four-wire systems of a circuit is realized, and the complexity of the transmitter is simplified.
(6) The transmitter has the advantages of good universality and replaceability, wide adjustment range, simple structure, stable performance, low production cost and easy mass production.
Drawings
Fig. 1 is a functional block diagram of the present invention.
FIG. 2 is a circuit diagram of the power input adjustment and voltage stabilization unit of the present invention.
Fig. 3 is a circuit diagram of the power polarity reversing output unit of the present invention.
Fig. 4 is a circuit diagram of a signal filtering unit of the present invention.
Fig. 5 is a circuit diagram of the zero point adjustment unit of the present invention.
Fig. 6 is a circuit diagram of a signal amplifying and output form switching unit of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a three-wire and four-wire universal transmitter comprises a power input adjusting and stabilizing unit 1, a power polarity inverting output unit 2 and a signal filtering unit 3 which are respectively connected with the power input adjusting and stabilizing unit 1, a signal amplifying and outputting form switching unit 4 connected with the signal filtering unit 3, and a zero adjusting unit 5 connected with the signal amplifying and outputting form switching unit 4;
referring to fig. 2, the POWER input adjusting and stabilizing unit 1 includes a POWER chip U6, a stabilizing chip U2, a resistor R1, a resistor R2, a diode D1, a diode D2, an inductor L1 and a plurality of capacitors, wherein the POWER positive input terminal POWER is connected to one end of the capacitor E1, one end of the capacitor C1, pins 7 and 8 of the POWER chip U6 through the diode D1, pins 1 and 2 of the POWER chip U6, a negative electrode of the diode D2 are connected to one end of the inductor L1, one end of the resistor R1, one end of the capacitor C2, one end of the capacitor E2, one end of the capacitor C3, one end of the capacitor C5, one end of the capacitor C4, one end of the capacitor E3, one end of the stabilizing chip U2, one end of the capacitor C1, one end of the capacitor C2, one end of the POWER chip U4 is connected to one end of the resistor R2, one end of the capacitor C6 is connected to pin 3 of the other end of the capacitor E1, one end of the capacitor C1, one end of the other end of the capacitor C6 is connected to the other end of the capacitor C2, one end of the capacitor C1, one end of the other end of the capacitor C1, one end of the capacitor C6, one end of the other end of the capacitor C2, one end of the other end of the capacitor C2, and the other end of the capacitor C2, one end of the capacitor C2 and the other end of the capacitor C2, and one end of the resistor C2, one end and one end of the resistor C2, and one end of the resistor and 3 and one end of the other end and 3 and 2, three end of the resistor and 2, and 2C 2, and 2;
when the power supply voltage of the transmitter changes within the range of 15-36V, the power supply chip U6 is matched with the resistors R1 and R2 to perform primary voltage stabilization on an input power supply by a 15uH inductor L1 and a plurality of capacitors, a stable voltage with strong anti-interference capability is output, the output size changes according to the resistance change of the R1 and the R2, and the primary voltage stabilization result is (1+R2/R1) 1.235V; and is regulated to be within 12-15V under normal conditions. Because the voltage obtained by primary voltage stabilization of the power supply is overlarge, and the amplifier, the sensor and other devices are inconvenient to directly connect, the secondary voltage stabilization is needed, the voltage stabilizing chip U2 adopts 78 series products as the voltage stabilizing device commonly used in the market, 78L08 is the voltage stabilizing device with relatively high cost performance, and the 8V voltage stabilizing chip can meet the requirement that the power supply of the sensor is not more than 15V and the power supply of the polarity reverser is not more than 12V.
Referring to fig. 3, the power polarity inverting output unit 2 includes a polarity inverting chip U1, a capacitor E5, a capacitor E6, a capacitor C7, and a capacitor C8, where two ends of the capacitor E5 are respectively connected to pins 2 and 4 of the polarity inverting chip U1, one end of the capacitor E6, one end of the capacitor C7, and one end of the capacitor C8 are all connected to pin 5 of the polarity inverting chip U1, and the other end of the capacitor E6, the other end of the capacitor C7, and the other end of the capacitor C8 are all connected to pin 3 of the polarity inverting chip U1;
conventionally, in an industrial environment, an amplifier can only be powered by a single power supply, when the output signal of a sensor introduced by a transmitter has a positive signal and a negative signal, an isolated positive power supply cannot form reasonable output, so that the amplification capability of an amplifying chip is increased by using reverse voltage in common use in the market; the polarity reversing chip U1 adopts ICL7660S which is the most commonly used polarity reversing device at present, and can rapidly realize the output reverse voltage by matching with two 10uF/10V capacitors as long as the power supply is not more than 12V.
Referring to fig. 4, the signal filtering unit 3 includes a capacitor C11, a capacitor C12, a capacitor C13, a resistor R3, and a resistor R4, wherein one end of the capacitor C11, one end of the capacitor C13, and one end of the resistor R3 are all connected to the sensor terminal GREEN, and the other end of the capacitor C13, one end of the resistor R4, and one end of the capacitor C12 are all connected to the sensor terminal WHITE, and the other end of the capacitor C11 and the other end of the capacitor C12 are grounded;
the invention selects two low-pass filters to finish the signal of the sensor without distortion, filters out high-frequency signals of 6MHz and above, and enhances the anti-interference capability of the amplifier.
Referring to fig. 5, the zero point adjusting unit 5 includes a resistor R13, a resistor R11, a resistor R14, a resistor R12, and an adjustable resistor RP2, wherein one end of the resistor R13, one end of the resistor R11, a pin 8 of the polarity reversing chip U1, one end of the capacitor C6, and a pin 3 of the voltage stabilizing chip U2 are all connected with the sensor terminal RED, one end of the resistor R14 and one end of the resistor R12 are all grounded, the other end of the resistor R13 and the other end of the resistor R11 are all connected with a fixed joint of the adjustable resistor RP2, and the other end of the resistor R14 and the other end of the resistor R12 are all connected with another fixed joint of the adjustable resistor RP 2;
the output signals of the conventional sensor are differential signals, and the output signals of the conventional voltage type amplifier cannot realize differential output, so that the output signals of the sensor are required to be reasonably adjusted; the zero point adjusting circuit of the transmitter is designed by using an adjustable resistor and 2 fixed value resistors.
Referring to fig. 6, the signal amplifying and outputting type switching unit 4 includes an operational amplifier U3, an operational amplifier U4, a plurality of resistors and an adjusting switch K1, wherein a pin 3 of the operational amplifier U3 is connected with the other end of the resistor R3, an adjustable joint of the adjustable resistor RP2 is connected with the other end of the resistor R4, one end of the resistor R1A and one end of the resistor RA after being connected in parallel, one end of the resistor R5 and one end of the resistor R6 are connected with a pin 2 of the operational amplifier U3, the other end of the resistor R1 and one end of the resistor RA after being connected in parallel are connected with a fixed joint of the adjustable resistor RP1, the other end of the resistor R6 and one end of the resistor R8 are connected with a pin 6 of the operational amplifier U3, the other end of the resistor R8 is connected with an output terminal VOUT1, a pin 7 of the operational amplifier U4, one end of the capacitor E6 is connected with one end of the capacitor C6, one end of the capacitor C7 is connected with a pin 5 of the capacitor C4, one end of the resistor C1 is connected with an end of the resistor C4, one end of the resistor C1 is connected with an adjustable joint of the resistor R1, and one end of the other end of the resistor R2 is connected with an adjustable resistor R2, and one end of the resistor R2 is connected with an end of the resistor R1, the common end of the resistor is connected with the resistor 10 is connected with the other end of the resistor 2, and the resistor 2 is connected with the other end of the resistor 2, and the resistor is connected with the resistor 2;
the operational amplifier U3 of the invention adopts a high-precision anti-interference amplifying device op07 to realize the amplified output of the sensor signal; the regulating switch K1 is the most critical part of the whole design, and when the regulating switch K1 is pressed, the circuit resistors R5 and R10 are disconnected from the opening end, so that the transmitter becomes a four-wire transmitter; when the regulating switch K1 is sprung, the regulating switch is closed, and the resistors R5 and R10 are connected, so that the transmitter becomes a three-wire transmitter. The concrete steps are as follows:
let r5=r7, r6=r10, and the parallel RA string RP1 of R1A be RG:
when the adjustment switch K1 is pressed, the circuit resistors R5, R10 are turned off. Obtaining I according to the basic principle of the deficiency short and deficiency broken of the operational amplifier 8 ＝I 6 I.e.The method comprises the following steps: />Obtain I 8 ＝I 3 I.e. +.>The method comprises the following steps: />Subtracting the formula (1) and the formula (2) to obtain the following formula:
further, it is derived that:i.e. four-wire magnification (+)>) Multiple times.
When the adjustment switch K1 is sprung, the circuit resistors R5, R10 are connected. The basic principle of the operational amplifier is that: i 8 +I 3 ＝I 2 The method comprises the following steps:the method comprises the following steps: i 8 +I 4 ＝I 6 The method comprises the following steps: />Adding the formula (4) and the formula (5) to obtain: />Further, it is derived that:i.e. the amplification of the three-wire system is (+)>) Doubling; if r5=r6=r7=r10, then the three-wire system has a magnification of (+.>) Multiple times.
The novel three-wire system and four-wire system universal transmitter comprises a sensor wiring terminal and a POWER supply output end, wherein the sensor wiring terminal comprises a sensor wiring terminal RED, a sensor wiring terminal BLACK, a sensor wiring terminal GREEN, a sensor wiring terminal WHITE and a frequency shielding interface PB1, and the POWER supply output end comprises an output end VOUT1, an output end VOUT2, a POWER supply positive electrode input end POWER, a grounding end GND and a frequency shielding interface PB2; the frequency shielding interface PB1 and the frequency shielding interface PB2 are connected into the transmitter shell to shield external signals; when in a three-wire system, the power supply output wiring is as follows: red 24V positive connection POWER, blue 24V negative/signal output negative connection GND, white VOUT1; when four-wire system, the power supply output wiring is: red 24V positive connection POWER, black 24V negative/signal output negative connection GND, green signal output positive connection VOUT1, white signal output negative connection VOUT2; the sensor wiring is: the RED excitation is connected with RED positively, the BLACK excitation is connected with BLACK negatively, the GREEN signal is connected with GREEN positively, the WHITE signal is connected with WHITE negatively, and the thick yellow frequency shielding line is connected with PB.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A three-wire system, four-wire system universal transmitter, characterized in that: the power supply polarity reversing output unit and the signal filtering unit are respectively connected with the power supply input adjusting and stabilizing unit, the signal amplifying and outputting form switching unit is connected with the signal filtering unit, and the zero point adjusting unit is connected with the signal amplifying and outputting form switching unit;
the POWER input adjusting and stabilizing unit comprises a POWER chip U6, a stabilizing chip U2, a resistor R1, a resistor R2, a diode D1, a diode D2, an inductor L1 and a plurality of capacitors, wherein the POWER input end POWER is respectively connected with one end of the capacitor E1, one end of the capacitor C1 and pins 7 and 8 of the POWER chip U6 through the diode D1, the pins 1 and 2 of the POWER chip U6 and the cathode of the diode D2 are respectively connected with one end of the inductor L1, one end of the resistor R1, one end of the capacitor C2, one end of the capacitor E2, one end of the capacitor C3, one end of the capacitor C5, one end of the capacitor C4, one end of the capacitor E3 and pin 1 of the stabilizing chip U2 are respectively connected with the other end of the inductor L1, the other end of the resistor R1, the other end of the capacitor C2 and the pin 4 of the POWER chip U6 are all connected with one end of the resistor R2, one end of the capacitor E4 and one end of the capacitor C6 are all connected with the pin 3 of the voltage stabilizing chip U2, and the other end of the capacitor E1, the other end of the capacitor C1, the pins 3,5,6 and 9 of the POWER chip U6, the positive electrode of the diode D2, the other end of the resistor R2, the other end of the capacitor E2, the other end of the capacitor C3, the other end of the capacitor C5, the other end of the capacitor C4, the other end of the capacitor E3, the pins 2,4 and 5 of the voltage stabilizing chip U2, the other end of the capacitor E4, the other end of the capacitor C6 and the sensor terminal BLACK are all grounded;
the power polarity reversing output unit comprises a polarity reversing chip U1, a capacitor E5, a capacitor E6, a capacitor C7 and a capacitor C8, wherein two ends of the capacitor E5 are respectively connected with pins 2 and 4 of the polarity reversing chip U1, one end of the capacitor E6, one end of the capacitor C7 and one end of the capacitor C8 are respectively connected with a pin 5 of the polarity reversing chip U1, and the other end of the capacitor E6, the other end of the capacitor C7 and the other end of the capacitor C8 are respectively connected with a pin 3 of the polarity reversing chip U1;
the signal filtering unit comprises a capacitor C11, a capacitor C12, a capacitor C13, a resistor R3 and a resistor R4, wherein one end of the capacitor C11, one end of the capacitor C13 and one end of the resistor R3 are all connected with a sensor terminal GREEN, the other end of the capacitor C13, one end of the resistor R4 and one end of the capacitor C12 are all connected with a sensor terminal WHITE, and the other end of the capacitor C11 and the other end of the capacitor C12 are grounded;
the zero point adjusting unit comprises a resistor R13, a resistor R11, a resistor R14, a resistor R12 and an adjustable resistor RP2, wherein one end of the resistor R13, one end of the resistor R11, a pin 8 of the polarity reversing chip U1, one end of the capacitor C6 and a pin 3 of the voltage stabilizing chip U2 are all connected with a sensor terminal RED, one end of the resistor R14 and one end of the resistor R12 are all grounded, the other end of the resistor R13 and the other end of the resistor R11 are all connected with a fixed joint of the adjustable resistor RP2, and the other end of the resistor R14 and the other end of the resistor R12 are all connected with the other fixed joint of the adjustable resistor RP 2;
the signal amplification and output form switching unit comprises an operational amplifier U3, an operational amplifier U4, a plurality of resistors and an adjusting switch K1, wherein a pin 3 of the operational amplifier U3 is connected with the other end of the resistor R3, an adjustable joint of the adjustable resistor RP2 is connected with the other end of the resistor R4, one end of the resistor R1A and one end of the resistor RA after being connected in parallel, one end of the resistor R5 and one end of the resistor R6 are connected with a pin 2 of the operational amplifier U3, the other end of the resistor R1A and one end of the resistor RA after being connected in parallel are connected with a fixed joint of the adjustable resistor RP1, the other end of the resistor R6 and one end of the resistor R8 are connected with a pin 6 of the operational amplifier U3, the other end of the resistor R8 is connected with an output end VOUT1, a pin 7 of the operational amplifier U3 and one end of the pin 7 of the resistor R4 are connected with one end of the resistor C4, one end of the resistor C7 is connected with the other end of the resistor R4, the common resistor R1 is connected with the pin 10, and the common resistor R1 is connected with the other end of the resistor R1, and the common resistor R1 is connected with the common end of the resistor R1;
when the regulating switch K1 is pressed down, the circuit resistors R5 and R10 are disconnected from the disconnection end, so that the transmitter becomes a four-wire transmitter; when the regulating switch K1 is sprung, the regulating switch is closed, and the resistors R5 and R10 are connected, so that the transmitter is changed into a three-wire transmitter; the concrete steps are as follows:
let r5=r7, r6=r10, and the parallel RA string RP1 of R1A be RG:
when the adjusting switch K1 is pressed, the circuit resistors R5 and R10 are disconnected; obtaining I according to the basic principle of the deficiency short and deficiency broken of the operational amplifier 8 ＝I 6 I.e.
The method comprises the following steps:obtain I 8 ＝I 3 I.e. +.>
The method comprises the following steps:subtracting the formula (1) and the formula (2) to obtain the following formula:
further, it is derived that:i.e. four-wire magnification ofDoubling;
when the regulating switch K1 is sprung, the circuit resistors R5 and R10 are connected; the basic principle of the operational amplifier is that: i 8 +I 3 ＝I 2 The method comprises the following steps:the method comprises the following steps: i 8 +I 4 ＝I 6 The method comprises the following steps:adding the formula (4) and the formula (5) to obtain:further, it is derived that: />
I.e. the magnification of the three-wire system isMultiple times.
2. The three-wire, four-wire universal transmitter of claim 1, wherein: the three-wire system and four-wire system universal transmitter comprises a sensor terminal and a POWER supply output end, wherein the sensor terminal comprises a sensor terminal RED, a sensor terminal BLACK, a sensor terminal GREEN, a sensor terminal WHITE and a frequency shielding interface PB1, the POWER supply output end comprises an output end VOUT1, an output end VOUT2, a POWER supply positive electrode input end POWER, a ground end GND and a frequency shielding interface PB2, and the frequency shielding interface PB1 and the frequency shielding interface PB2 are connected into a transmitter shell to shield external signals in a frequency mode.
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| CN201610872388.3A CN106370915B (en) | 2016-09-30 | 2016-09-30 | Three-wire system and four-wire system universal transmitter |
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| CN107357216B (en) * | 2017-08-25 | 2023-02-21 | 安徽天光传感器有限公司 | Rail-mounted multi-channel digital transmitter |
| CN108400710A (en) * | 2018-05-14 | 2018-08-14 | 苏州工业职业技术学院 | A kind of novel ultra-wide input DC reduction voltage circuits |
| CN109030901B (en) * | 2018-08-06 | 2023-09-26 | 安徽天光传感器有限公司 | Built-in voltage and current integrated transmitter |
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